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371871d685
* change gas cost for contract creating txs * invalidate signature with s value greater than secp256k1 N / 2 * OOG contract creation if not enough gas to store code * new difficulty adjustment algorithm * new DELEGATECALL op code
124 lines
4.2 KiB
Go
124 lines
4.2 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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)
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// GetHashFn returns a function for which the VM env can query block hashes thru
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// up to the limit defined by the Yellow Paper and uses the given block chain
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// to query for information.
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func GetHashFn(ref common.Hash, chain *BlockChain) func(n uint64) common.Hash {
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return func(n uint64) common.Hash {
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for block := chain.GetBlock(ref); block != nil; block = chain.GetBlock(block.ParentHash()) {
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if block.NumberU64() == n {
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return block.Hash()
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}
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}
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return common.Hash{}
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}
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}
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type VMEnv struct {
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state *state.StateDB
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header *types.Header
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msg Message
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depth int
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chain *BlockChain
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typ vm.Type
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getHashFn func(uint64) common.Hash
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// structured logging
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logs []vm.StructLog
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}
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func NewEnv(state *state.StateDB, chain *BlockChain, msg Message, header *types.Header) *VMEnv {
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return &VMEnv{
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chain: chain,
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state: state,
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header: header,
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msg: msg,
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typ: vm.StdVmTy,
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getHashFn: GetHashFn(header.ParentHash, chain),
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}
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}
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func (self *VMEnv) Origin() common.Address { f, _ := self.msg.From(); return f }
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func (self *VMEnv) BlockNumber() *big.Int { return self.header.Number }
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func (self *VMEnv) Coinbase() common.Address { return self.header.Coinbase }
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func (self *VMEnv) Time() *big.Int { return self.header.Time }
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func (self *VMEnv) Difficulty() *big.Int { return self.header.Difficulty }
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func (self *VMEnv) GasLimit() *big.Int { return self.header.GasLimit }
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func (self *VMEnv) Value() *big.Int { return self.msg.Value() }
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func (self *VMEnv) Db() vm.Database { return self.state }
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func (self *VMEnv) Depth() int { return self.depth }
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func (self *VMEnv) SetDepth(i int) { self.depth = i }
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func (self *VMEnv) VmType() vm.Type { return self.typ }
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func (self *VMEnv) SetVmType(t vm.Type) { self.typ = t }
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func (self *VMEnv) GetHash(n uint64) common.Hash {
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return self.getHashFn(n)
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}
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func (self *VMEnv) AddLog(log *vm.Log) {
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self.state.AddLog(log)
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}
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func (self *VMEnv) CanTransfer(from common.Address, balance *big.Int) bool {
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return self.state.GetBalance(from).Cmp(balance) >= 0
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}
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func (self *VMEnv) MakeSnapshot() vm.Database {
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return self.state.Copy()
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}
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func (self *VMEnv) SetSnapshot(copy vm.Database) {
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self.state.Set(copy.(*state.StateDB))
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}
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func (self *VMEnv) Transfer(from, to vm.Account, amount *big.Int) {
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Transfer(from, to, amount)
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}
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func (self *VMEnv) Call(me vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
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return Call(self, me, addr, data, gas, price, value)
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}
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func (self *VMEnv) CallCode(me vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
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return CallCode(self, me, addr, data, gas, price, value)
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}
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func (self *VMEnv) DelegateCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error) {
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return DelegateCall(self, me, addr, data, gas, price)
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}
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func (self *VMEnv) Create(me vm.ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error) {
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return Create(self, me, data, gas, price, value)
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}
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func (self *VMEnv) StructLogs() []vm.StructLog {
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return self.logs
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}
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func (self *VMEnv) AddStructLog(log vm.StructLog) {
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self.logs = append(self.logs, log)
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}
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